/*
 * @(#)KeyboardHook.java	1.0 Mar 8, 2008
 *
 *	The MIT License
 *
 *	Copyright (c) 2008 Malachi de AElfweald <malachid@gmail.com>
 *
 *	Permission is hereby granted, free of charge, to any person obtaining a copy
 *	of this software and associated documentation files (the "Software"), to deal
 *	in the Software without restriction, including without limitation the rights
 *	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *	copies of the Software, and to permit persons to whom the Software is
 *	furnished to do so, subject to the following conditions:
 *
 *	The above copyright notice and this permission notice shall be included in
 *	all copies or substantial portions of the Software.
 *
 *	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 *	THE SOFTWARE.
 */
package org.eoti.io.console;

import org.eoti.util.TimeUtil;

import java.io.Console;
import java.io.IOException;
import java.io.Reader;

public class KeyboardHook<APPLICATION>
	extends Thread
{
	protected APPLICATION app;
	protected boolean dead = false;
	protected TimeUtil.Unit timeUnit;
	protected long timeDelay;
	protected Console console;
	protected Reader reader;

	public KeyboardHook(APPLICATION app)
			throws IOException
	{
		this(app, TimeUtil.Unit.Second, 1);
	}

	public KeyboardHook(APPLICATION app, TimeUtil.Unit timeUnit, long timeDelay)
			throws IOException
	{
		super("KeyboardHook: "+app);
		this.setDaemon(true);
		this.app = app;
		this.timeUnit = timeUnit;
		this.timeDelay = timeDelay;
		console = System.console();
		if(console == null)
			throw new IOException("Console not supported on this platform.");

		reader = console.reader();
		this.setPriority(this.getPriority()+1);
	}

	public void die()
	{
		this.dead = true;
	}

	public void run()
	{
		while(!dead)
		{
			timeUnit.sleep(timeDelay);
			try{
				if(!reader.ready())
					continue;

				reader.read();
				if(dead) continue; // avoid printing AFTER solution
				execHook();
			} catch(Exception e){
				// do nothing?
			}
		}
	}

	public void execHook()
	throws Exception
	{

	}
}
